Airframe Systems & Components: Aircraft Fuel Systems 🔊 Flashcards
What is the purpose of a fuel dump system?
It is an emergency system for bringing the aircraft down to maximum landing weight
Other than reducing weight, what other function can be accomplished with a fuel jettisoning system?
Fuel can be dumped from the heavy side for lateral stability
What are a few types of fuel cells?
Bladder type fuel cell, integral fuel cell, integral fuel tanks, and welded or riveted fuel tanks
How is the weight of a bladder type cell supported?
They depend on the structure of the cavity in which it sits to support the weight and maintain the shape
What is “wet wing” construction?
It is when the fuel cells are built into the wings of the aircraft’s structure using the skin to contain the fuel. Also known as integral fuel cells
What markings must be placed near the fuel filler opening on reciprocating engine aircraft?
“Avgas” and minimum fuel grade
What are the advantages of a single point pressure fueling system and what is it sometimes called?
Also called pressure fueling or underwing fueling, it greatly reduces the time required to service large aircraft. It also reduces the chances of fuel contamination.
After fueling an aircraft, why is it important for a technician to wait at least 30 minutes prior to taking a fuel sample?
It allows enough time for water and contaminants to settle into the sumps.
Why should the fuel sumps of aircraft be drained before the first flight of the day?
To remove water
What does water look like when in fuel that has been drained from the sumps?
Clear balls of jelly
What is the purpose of a fuel temperature indicator on a turbine engine?
Checking the temperature of fuel in the tanks at the engine to determine when there may be a danger of ice crystals forming in the fuel
What is the purpose of warning lights in connection with the fuel system?
To indicate when the fuel pressure is too low or the quantity in a tank is below a certain amount
Where are electrically operated valve-in-transit indicator lights used?
On large multiengine aircraft, each fuel cross feed and line valves may be provided with a valve-in-transit indicator light. They are on when the valve is in motion.
Why do fuel selectors have detents?
To “lock” the switch into the selected position and so the operator can feel when the fuel is in a specific position
What are four general types of fuel quantity gauges?
Sight glass (visual), mechanical (linkage), electrical (transmitter/receiver), and electronic (totalizer)
